Drill puller



June 27, 1933. M, J, wo c 1,915,345

DRILL FULLER Filed Oct. 14., 1951 I 2 Sheets-Sheet l JVVEN TUE June 27, 1933.

IIIIIIII/IIIIIII/IIIIIA l".

M. J. WOZ-NACK 1,915,345

DRILL FULLER Filed Oct. 14, 1931 2 Sheets-Sheet 2 T TUBA/5Y5.

Patented June 27, 1933 PATENT OFFICE:

MICHAEL J. WOZNACK, or sen FRANCISCO, CALI ORNIA, ASSIGNOR or ONE-HALF .5130

,En aewsolv, or orcVILLE; CALIFORNIA.

DRILL PULLEB This invention relates to improvements in drill pullers.

An object of the invention is to provide a device which can beeasily and quickly apif plied to the stem of a rock drill or the like which will facilitate withdrawing the drill from the drill hole." In using rock drills of the percussion type in drilling through rock, M concrete, or similar substances, it frequently occurs that the drill becomes jammed or wedged in the drill hole so that it is very diflicult to extricate it. The improved construction is so designed that it will efi'ectively grip upon the drill stem and will have a suificient mechanical advantage present to enable the drill to be pull-ed easily from the drill hole.

Another object of the invention is to pro- 1.. vide a drill puller havinga drill stem embracing member on which there are drill stem grips and an elevating construction operable upon the grips to cause them to grip on the drill stem and then elevate it. The design is such that the greater the lifting effort, the greater the grip will be upon the drill stem.

Still another object of the invention is to provide a drill puller which is so designed as to permit successive lifts of the drill to be easily and quickly accomplished by the device.

With the foregoing and other objects in view, which will be made manifest in the following detailed description, and specifically pointed out in the appended claims, reference 3 is had to the accompanying drawings for an illustrative embodiment of the invention, wherein:

Fig. 1 is a partial View in side elevation "4 illustrating the improved drill puller in applied position on a drill which has become fast within its drill hole, the drill hole being illustrated in vertical section.

Fig. 2 is a top plan view taken in the di- 4-5 rection of the arrow 2 upon Figure 1, the drill being illustrated in horizontal section.

Fig. 3 is a vertical section taken substan tially upon the line 33 upon Figure 2.

Fig. 4 is a vertical section taken substanto tially upon the line t--1 upon Figure2.

communicate with'the" groove 21 and have Application filed October 14, 1931. Serial no; 568,825.

Fig. 5 is a vertical section taken substarh tially upon the line 55 upon Figure 3,

, Referring to the accompanying drawings, wherein similar reference characters designate similar parts throughout, the improved drill puller comp-rises a base having an arcuate recess 11 near its center adapted to be positioned over a drill hole H within which a drill D may have been drilling and become fast. The base 10 has ap'air of opposed, upright standards 12 and 13 having notches in their upper ends indicated at 14 for the reception of trunnions 15 and 16 on a bifurcated or forked lever 17. This bifurcated orforked lever, which is fulcrumed'on the base by means of the trunnions, may have a removable tubular handle-18. The arms or sides of the bifurcated or forked lever 17 are slotted at their forward ends as indicated at 19. \Vithin the forked lever 17- there is a drill stem embracing member 20 which is adapted to be caused to embrace the stem of the drill S. Thisdrill stem embracing member has a vertical groove 21 formed thereon adapted to receive the stem S and is provided with a removable forward plate 22 which may be secured in place as by screws 23. In the sides of the drill stem embracing member 20 there are formed recesses 24 and 25 which E13 pivoted therein drill stem grips 26 and 27. ihese grips are pivotally mounted on pivots 28 and 29 respectively and are eccentrically shaped, that is, the radius from the centers of their respective pivots gradually increases upwardly. The eccentric peripheral surfaces on these grips have upwardly directed teeth, as clearly shown in Figure 3. Each grip has an outwardly extending arm, the arms being indicated at 30 and 31 respectively, which is disposed within its respective side or armof the forked lever 17. Preferably the arms have hemispherical portions 32 which bear upon the bottoms of the slots 19,

The operation and advantages of the improved drill puller are as follows. When the drill D has become fast in the hole H, the drill stem embracing member 20 is first applied thereto and the plate, 22 secured in place by means of screws 23. Thebase 10 is then .1 3

positioned near the hole and the forked lever 17 positioned thereon. The arms 30 and 31. are then positioned within thev slots 19. When the upper end of the lever is moved downwardly it first swings the arms 30 and 31 upwardly, causing the grips 26 and 27 to first grip on the stem S. As soon as these grips engage the stem, continued liftingeffort exerted by the lever on the arms causes the grips to lift the drill. The great mechanical advantage present is ordinarily sufficient to extricate the drill from the hole regardless of howfast or how tightly it may have become wedged. A single movement of the lever will, of course, only lift the drill a short distance,vhowever, by reversing the movement of the lever, the arms 30 and 31 will be engaged-by the upper sides of the slots 19 and will pivot slightly to disengage the drill. This permits the stem embracing member 20 and the grips to slide downwardly on the stem and a new grip taken on the drill and a successive lift. v In some instances the drill is almost completely within the hole. On the conventional-drill there is ordinarily a squared head 33 near Which there is-a shoulder 34. In order to take care of such conditions theforward side of the stem embracing member 20 has a recess '35 formed thereon near the bottom of groove 21. p The plate 22 likewise has a recess 36. These recesses cooperate to receive the shoulder: 3 and although the head 33 may be too short to be gripped by the toothed surfaces on the grips, it will extend upwardly'a sufiicient distance to form an abutment for the grips-to enable the drill stem embracing member 20 to be liftedby the arms-30 and 31. I From the above described construction it will be appreciated that a novel,.simple and advantageous drill puller is provided which forked lever having trunnions on the arms of the fork pivoted upon the base, a drill stem embracing member having a groove adapted to receive a drill stem, and eccentrically shaped toothed drill stem grips pivotally mounted upon the drill stem embracing member, said grips having outwardly -mounted upon the drill stem embracln member, each arm of the fork' being slotte said grips having arms extending into the slots of the arms of the lever so as to be capable of being lifted thereby. V

In testimony whereofl have signed my name to this specification.-

MICHAEL J. WOZNACK.

is of relatively simple yet durable construction. A great mechanical advantage is present and the design is such as to insure the establishment of a good grip on the drill stem' during the pulling.

Various changes may be made in the details of construction without departing from the spirit or scope of the invention as dc fined by the appended claims. lclaimpj v .lrA drill puller comprising a base, a forked leverfulcrumed upon the base, a drill stem embracing member having a vertical groove adapted to receive a drill stem, eccentrically shaped toothed drill stem' grips pivotally mounted upon the drill stem embracing member, said grips having outwardly ext endinga-rms adapted to be lifted by the forked lever, said "embracing'member having a removable plate, the embracing member and plate having recesses formed thereon beneath the grips adaptedto receive the shoulder on the conventional rock drill.

: 2. A drill puller comprising "a base, a 

